CVE record · CVE-2026-15709

Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

CVSS 7.5 HighEPSS 0.0088 · 59th percentile

Published by the CVE Program (CNA: redhat) at 14 Jul 2026, 19:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 10 Package name: libsoup3 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.5-3.el10_2.14 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support Package name: libsoup3 https://access.redhat.com/downloads/content/package-browser/	unaffected 0:3.6.5-3.el10_0.17 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-2.el8_4.10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-2.el8_4.10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-2.el8_6.10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-2.el8_6.10 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-3.el8_8.11 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.62.3-3.el8_8.11 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.72.0-16.el9_8.3 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.72.0-8.el9_2.13 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.72.0-8.el9_4.12 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	unaffected 0:2.72.0-10.el9_6.9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 6 Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unknown
Red Hat	Red Hat Enterprise Linux 7 Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unknown
Red Hat	Red Hat Enterprise Linux 8 Package name: libsoup https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: affected

Identifiers: CVE-2026-15709
CNA: redhat
Weakness (CWE): CWE-409
Tags: Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
CWE-409
Published: 14 Jul 2026
Updated: 5 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (redhat)

CISA KEV Not listed.
EPSS 0.0088, the 59th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

14 Jul 2026, 19:41 UTC Confirmed by the CVE List
14 Jul 2026, 20:16 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2026:68234 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:68235 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:68612 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:69108 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:69297 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:69863 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:70598 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:70599 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2026:71389 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2026-15709 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2499922 issue-trackingredhat
gitlab.gnome.org/GNOME/libsoup/-/issues/511

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.